ITBO940046A1 - Protesi articolare interna alleggerita - Google Patents
Protesi articolare interna alleggerita Download PDFInfo
- Publication number
- ITBO940046A1 ITBO940046A1 IT94BO000046A ITBO940046A ITBO940046A1 IT BO940046 A1 ITBO940046 A1 IT BO940046A1 IT 94BO000046 A IT94BO000046 A IT 94BO000046A IT BO940046 A ITBO940046 A IT BO940046A IT BO940046 A1 ITBO940046 A1 IT BO940046A1
- Authority
- IT
- Italy
- Prior art keywords
- lightened
- prosthesis
- fact
- prosthesis according
- bone
- Prior art date
Links
- 210000000988 bone and bone Anatomy 0.000 claims description 18
- 208000029154 Narrow face Diseases 0.000 claims description 2
- 230000000284 resting effect Effects 0.000 claims description 2
- 230000006378 damage Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 210000001519 tissue Anatomy 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 210000000689 upper leg Anatomy 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000002745 epiphysis Anatomy 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000011164 ossification Effects 0.000 description 1
- 230000002642 osteogeneic effect Effects 0.000 description 1
- 230000035479 physiological effects, processes and functions Effects 0.000 description 1
- 230000002980 postoperative effect Effects 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000000472 traumatic effect Effects 0.000 description 1
- 230000003966 vascular damage Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30593—Special structural features of bone or joint prostheses not otherwise provided for hollow
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00029—Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
Abstract
Protesi articolare interna alleggerita in cui l'infibulo è costituito da una struttura e traliccio che superiormente è chiusa e presenta un attacco tronco conico per una sfera di articolazione all'anca.
Description
Titolo :PROTESI ARTICOLARE INTERNA ALLEGGERITA
DESCRIZIONE
Forma oggetto del presente trovato una protesi articolare interna alleggerita .
Sono note protesi interne che vanno a sostituire a zone ossee sofferenti: in particolare seno note protesi d’anca consistenti in un infittilo che viene infilato nel femore, previa asportazione dell'epifisi femorale, e che termina superiormente o con un attacco conico, per l'accoppiamento di una sfera di articolazione all'anca,o con la sfera stessa.
Tali infibuli noti sono di norma realizzati pieni e la loro installazione conporta la creazione preventiva nella zona spongiosa dell'osso di un foro calibrato: l'inserimento di tali protesi determina la distruzione, rimozione o danneggiamento sia di tessuto osseo che di midollo.
Successivamente alla installazione ,a causa sia della traumaticità dell'intervento che della compattezza della struttura estranea impiantata, risultano essere molto ritardati i processi di guarigione: si riscontrano infatti notevoli danni alla circolazione sanguigna periprotesica dei tessuti ospiti. I tessuti contigui alla protesi,non ben alimentati, rischiano di perdere in capacità di sostegno della protesi stessa.
Oltre a ciò le protesi note presentano una notevole rigidezza e quindi, in esercizio, assumano su di sè la maggior parte del momento flettente indotto dalle forze articolari sull'insieme protesi-osso ospite: in relazione a ciò l'osso risulta caricato molto meno che nella realtà fisiologica e pertanto tende con il tempo a riassorbirsi, rarefarsi, perdendo capacità di carico e di sostegno della protesi stessa, con probabile scollamento .
Quanto esposto fa sì che il successo a lungo temine dell'intervento di pròtesizzazione viene difficilmente conseguito. Carpito tecnico del presente trovato è quello di ovviare ai citati inconvenienti delle protesi note, di mettere a punto cioè una protesi articolare interna alleggerita che non comporti esecuzione di scavi nel tessuto osseo spongioso e danneggiamento abnorme dei tessuti e che contribuisca con la ridotta rigidezza a conservare e determinare un buon accoppiamento fra protesi e tessuto osseo.
Nell'ambito di tale carpito tecnico, altro scopo del presente trovato è quello di assolvere il carpito precedente con una struttura semplice, di relativamente facile attuazione pratica, di sicuro inpiego ed efficace funzionamento,nonché di costo relativamente contenuto.
Questo carpito e questi scopi vengono tutti raggiunti dalla presente protesi articolare interna alleggerita caratterizzata dal fatto che l'infibulo è costituito da una struttura a traliccio che superiormente è chiusa e presenta un attacco tronco conico per una sfera di articolazione all'anca.
Ulteriori particolarità risulteranno maggiormente chiare ed evidenti dalla descrizione dettagliata di una forma di esecuzione preferita, ma non esclusiva, di una protesi articolare interna alleggerita secondo il trovato, illustrata a titolo indicativo, ma non limitativo, nelle unite tavole di disegni, in cui:
la fig.l rappresenta viste in proiezione ortogonale parzialmente sezionate di una protesi articolare interna alleggerita secondo il trovato ;
la fig.2 rappresenta viste in proiezione ortogonale parzialmente sezionate di una forma di esecuzione alternativa della protesi di fig.l.
Con particolare riferimento a tali figure è indicata globalmente con 1 una protesi articolare interna alleggerita secondo il trovato.
La protesi 1 conprende un infibulo 2 che è costituito da una struttura a traliccio che superiormente ha una zona chiusa 3 e presenta un attacco tronco-conico 4 per una sfera di articolazione all'anca.
La struttura di 2 in sezione trasversale ha conformazione sostanzialmente di rettangolo cavo 5 rastremartesi verso il basso ed ha forma sostanzialmente analoga e quella delle protesi piene di tipo tradizionale: in altre previste versioni la struttura 2 potrà avere sezione diversa, ad esempio ellittica o altro.
La struttura a traliccio presenta quattro correnti longitudinali 6a, 6b, 6c, 6d disposti in corrispondenza degli spigoli e una pluralità di traversi 7, 8 e diagonali 9 raccordati ai correnti che conformano aperture o asole 10 sostanzialmente rettangolari sulle facce strette e triangolari 11 sulle facce larghe dell'infibulo: i raccordi incurvati fra correnti, traversi e diagonali evitano il formarsi di pericolosi effetti di concentrazione delle tensioni meccaniche nei nodi della struttura.
Il numero e le dimensioni dei diagonali e dei traversi ed i materiali costitutivi potranno essere diversi a seconda delle necessità per fornire protesi con caratteristiche di rigidezza modulate nel senso di potere essere variate regolarmente in funzione delle caratteristiche e delle necessità del paziente. La zona chiusa 3, che all'interno può essere alleggerita con una cavità sagomata 12, può presentare o mano alla base un colletto 13 di tipo noto per l'appoggio sulla faccia sezionata dell'osso.
La estremità inferiore dell'infibulo può essere interessata da più asole, fig.l, ed essere sostanzialmente arrotondata ovvero da una unica asola lunga, fig.2: per facilitare l'inserimento nell'osso l'estremità inferiore dell'infibulo potrà essere affilata.
In altra versione prevista l'estremità inferiore, distale, dell'infibulo potrà presentare solamente la cavità assiale ma non le asole perimetrali per consentire una agevole introduzione nell'osso spugnoso evitando nel contempo che si possa determinare vincolo rigido dell'osso con la estremità inferiore della protesi, vincolo che, in caso di necessità di reintervento, renderebbe molto problematica la rimozione della protesi.
I materiali costitutivi la protesi saranno scelti fra le classiche leghe metalliche per inpianti permanenti ( leghe cobalto-cromo, leghe a base di titanio o simili).
Si fa notare che la protesi secondo il trovato può essere installata senza bisogno di praticare un foro preventivo nell'-osso e che, essendo la sezione dell'infibulo di area ridotta, non si creano danni vascolari e non si asporta la preziosa materia ossea.
In relazione a ciò l'infibulo si trova " stretto" fisicamente e meccanicamente all'interno del femore; già nell'irtmediato periodo postoperatorio le trabecole ossee tranciate durante I'inserzione della protesi potranno dare luogo ad una agevole e rapida " risaldatura".
II rispetto massimo delle strutture osteogenetiche consente l'osteogenesi intorno alle strutture della protesi.
Il traliccio permette l'invasione massiva di osso neoprodotto nei vuoti presenti con inglobamento completo della struttura protesica.
La proliferazione dell'osso attorno ai componenti della struttura protesica consente una ricostruzione dei sistemi traiettoriali dell'osso più vicina possibile alla fisiologia, condizione indispensabile per una buona distribuzione delle sollecitazioni.
Data la maggiore deformabilità rispetto alle protesi piene ed al fatto che la protesi secondo il trovato ha rigidezza che può essere modulata in funzione delle caratteristiche del paziente,è possibile ritrasferire al femore un'aliquota maggiore di memento flettente riducendo una delle potenziali cause di fallimento delle protesizzaziani d'anca.
Si è così visto acme il trovato raggiunge gli scopi proposti. Il trovato così concepito è suscettibile di numerose modifiche e varianti tutte rientranti nell'ambito del concetto inventivo.
Inoltre tutti i dettagli sono sostituibili da altri tecnicamente equivalenti.
In pratica i materiali impiegati, nonché le forme e le dimensioni,potranno essere qualsiasi a seconda delle esigenze senza per questo uscire dall' ambito di protezione delle seguenti rivendicazioni.
Claims (6)
- RIVENDICAZIONI 1) Protesi articolare interna alleggerita caratterizzata dal fatto che l'infibulo è costituito da una struttura a traliccio che superiormente è chiusa e presenta un attacco tronco conico per una sfera di articolazione all'anca.
- 2) Protesi secando la rivendicazione 1 caratterizzata dal fatto che detta struttura a traliccio in sezione trasversale ha conformazione sostanzialmente di rettangolo cavo rastremantesi verso il basso.
- 3) Protesi secondo la rivendicazione 2 caratterizzata dal fatto che detta struttura a traliccio presenta quattro correnti longitudinali disposti in corrispondenza degli spigoli e una pluralità di traversi e diagonali raccordati ai correnti che conformano aperture sostanzialmente rettangolari sulle facce strette e triangolari sulle facce larghe dell infibulo.
- 4) Protesi secondo la rivendicazione 3 caratterizzata dal fatto che detta struttura nella zona inferiore non presenta aperture perimetrali ma solamente la cavità longitudinale assiale.
- 5) Protesi secondo la rivendicazione 1 caratterizzata dal fatto che superiormente presenta un colletto di tipo noto per l'appoggio sulla faccia sezionata dell'osso.
- 6) Protesi articolare interna alleggerita secondo una o più delle rivendicazioni precedenti e secondo quanto descritto ed illustrato agli scopi specificati.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO940046A IT1273246B (it) | 1994-02-04 | 1994-02-04 | Protesi articolare interna alleggerita |
EP95100855A EP0674886A1 (en) | 1994-02-04 | 1995-01-23 | Lightened internal articular prosthesis |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO940046A IT1273246B (it) | 1994-02-04 | 1994-02-04 | Protesi articolare interna alleggerita |
Publications (3)
Publication Number | Publication Date |
---|---|
ITBO940046A0 ITBO940046A0 (it) | 1994-02-04 |
ITBO940046A1 true ITBO940046A1 (it) | 1995-08-04 |
IT1273246B IT1273246B (it) | 1997-07-07 |
Family
ID=11339477
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ITBO940046A IT1273246B (it) | 1994-02-04 | 1994-02-04 | Protesi articolare interna alleggerita |
Country Status (2)
Country | Link |
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EP (1) | EP0674886A1 (it) |
IT (1) | IT1273246B (it) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2976789B1 (fr) * | 2011-06-23 | 2014-07-25 | Rech S Et De Fabrication Serf Soc Et | Tige femorale pour prothese de hanche |
US9301765B2 (en) | 2011-12-16 | 2016-04-05 | Chow Ip, Llc | Prosthetic femoral stem for use in high offset hip replacement |
US8992531B2 (en) | 2011-12-16 | 2015-03-31 | Chow Ip, Llc | Prosthetic femoral stem for use in high impact hip replacement |
ITMI20121334A1 (it) * | 2012-07-31 | 2014-02-01 | Uni Degli Studi Brescia | Stelo femorale per protesi d'anca. |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH650400A5 (fr) * | 1981-12-08 | 1985-07-31 | Jean Butel | Procede de fabrication d'une prothese de hanche a tige flexible. |
CS245599B1 (en) * | 1984-11-09 | 1986-10-16 | Rudolf Pavlansky | Adaptable isoelastic hip endoprosthesis |
CH669902A5 (it) * | 1986-04-30 | 1989-04-28 | Kurt Karpf | |
DE3627097A1 (de) * | 1986-08-09 | 1988-02-18 | S & G Implants Gmbh | Stiel fuer gelenk-endoprothesen |
DE3715000A1 (de) * | 1987-05-06 | 1988-11-17 | Krupp Gmbh | Gelenkprothese und verfahren zu ihrer herstellung |
DE8712578U1 (de) * | 1987-09-17 | 1987-12-17 | Howmedica GmbH, 2314 Schönkirchen | Oberschenkelteil einer Hüftgelenkendoprothese |
DE3743329C1 (en) * | 1987-12-21 | 1989-06-22 | Krupp Gmbh | Endoprosthesis hollow stem for cement-free implantation |
-
1994
- 1994-02-04 IT ITBO940046A patent/IT1273246B/it active IP Right Grant
-
1995
- 1995-01-23 EP EP95100855A patent/EP0674886A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
EP0674886A1 (en) | 1995-10-04 |
ITBO940046A0 (it) | 1994-02-04 |
IT1273246B (it) | 1997-07-07 |
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